FX Oil Light on at 5000rpm

I recently rebuilt a 2003 FX 140 and just got it in the water to test today. when i first started it up (on the trailer) after the rebuild the oil light came on. I shut it down to confirm wire connections and oil level...all was OK. Started it back up (on the trailer) ran it for 15 minutes...no more oil light. today i put it in the lake and ride it under 5000 rpms with no problems. i bring the rpms over 5000 and the oil light comes on....i shut it down quickly to look for oil blowing out somwhere or, for whatever reason, low oil...i find no problems. i start it back up...no oil light...so now im curious...wtf is going on...

i ride the boat for about 5 minutes un the 4000 rpm area...no issues...no oil light.

i take it just above 5000 and the damn oil light comes on...shut it down quickly and restart...no oil light. i did this 2 more times...and as soon as the rpms go over 5k the light goes on. keep it under 5k and you can ride with no issues.

so now i start wondering...sensor? or a check valve sticking in the oil pump.

i pull the boat out of the water and check the sensor...its per spec...at around 18psi it kicks on.

the oil pump looked like it was in great condition when i rebuilt the motor (40 hours on the clock). i tore the oil pump apart to clean everything down and verify its general condition. going to look through the manual again to see if i can understand the function of the check valve. its odd that as soon as i go over 5k the light comes on....i will be picking up a manual guage to verify the pressure and what happens at 5k.

i did notice the air filter is saturated with oil...going to order a new filter..it was like this fron the guy who killed the motor last year...BTW, the guy who blew the boat up last years said, "the oil light came on then it stopped". well, he threw a rod through the cases...so that light didnt just come on and it threw a rod....my guess is he was riding at 9k..the lgiht came on and he either didnt lay off the throttle or he hammered it to the ramp. so...with that said....there is a problem somewhere...and i missed it in the rebuild.

the only thing i can think of other than a presure reliefe valve opening is the 140 hire skis here that were blowing up at 400 plus hours were caused by the oil pump shaft floging out in the case causing a lose of oil presure

the only thing i can think of other than a presure reliefe valve opening is the 140 hire skis here that were blowing up at 400 plus hours were caused by the oil pump shaft floging out in the case causing a lose of oil presure

kev

did the little pin that sets the shaft on the rotor actually fail? or did the shaft end break off?

got a guage on it tonight and verified very low oil pressure,,,,glad i kept the rpms low...cut open the oil filter to make sure the bearings didnt get damaged,,,,no debris present....now,,,wtf is the oil pressure so low??

perhaps a bad seal that i didnt see on the rebuild? pressure relief valve stuck open? ordering a new pump so i have it here in case its needed.....